Bargava wrote:

If you use proxy authentication and you want to restrict the multiple login from other machine. the 'max_user_ip' ACL, this directive controls how long Squid remembers the IP addresses associated with each user. Use a small value (e.g., 60 seconds) if your users might change addresses quickly, as is the case with dialups. You might be safe using a larger value (e.g., 2 hours) in a corporate LAN environment with relatively static address assignments.

we have to add these below four lines in squid.conf in correct place.

authenticate_ip_ttl 300 seconds # Proxy will remember the Ip addresses associated with each user.
acl max_user max_user_ip -s 1 #1 represents how many user can login in different machines.
http_access deny max_user
deny_info maxuser.htm ip_limit
For your reference :-
# vi /etc/squid/squid.conf
Eg.
# TAG: authenticate_ip_ttl
#
#Default:
# authenticate_ip_ttl 0 seconds
authenticate_ip_ttl 300 seconds

# TAG: acl
# Defining an Access List

acl max_user max_user_ip -s 1
http_access deny max_user
# TAG: deny_info
# Usage: deny_info err_page_name acl
deny_info maxuser.htm max_user
Note :-
Create a file in the name of maxuser.htm with your error info. The file should be copied into /etc/squid/error directory.
Don’t forget restart the service
Service squid restart.

dear bargava,
i was configuration my squid.conf like you say,but it can not control multiple login from other machine,can you help why? attachment about my squidi.conf

If you use proxy authentication and you want to restrict the multiple login from other machine. the 'max_user_ip' ACL, this directive controls how long Squid remembers the IP addresses associated with each user. Use a small value (e.g., 60 seconds) if your users might change addresses quickly, as is the case with dialups. You might be safe using a larger value (e.g., 2 hours) in a corporate LAN environment with relatively static address assignments.

we have to add these below four lines in squid.conf in correct place.

authenticate_ip_ttl 300 seconds # Proxy will remember the Ip addresses associated with each user.
acl max_user max_user_ip -s 1 #1 represents how many user can login in different machines.
http_access deny max_user
deny_info maxuser.htm ip_limit
For your reference :-
# vi /etc/squid/squid.conf
Eg.
# TAG: authenticate_ip_ttl
#
#Default:
# authenticate_ip_ttl 0 seconds
authenticate_ip_ttl 300 seconds

# TAG: acl
# Defining an Access List

acl max_user max_user_ip -s 1
http_access deny max_user
# TAG: deny_info
# Usage: deny_info err_page_name acl
deny_info maxuser.htm max_user
Note :-
Create a file in the name of maxuser.htm with your error info. The file should be copied into /etc/squid/error directory.
Don’t forget restart the service
Service squid restart.